Kirchhoff's second law is a consequence of a basic principle. What is this principle?
A.
The charge flowing in an electric circuit is conserved.
B.
The energy in an electric circuit is conserved.
C.
The sum of the electric currents entering a point in an electric circuit is equal to the sum of the electric currents leaving that point.
D.
The sum of the potential differences in an electric circuit is equal to the sum of the products of the current and resistance.
Exam No：9702_w24_qp_11 Year：2024 Question No：31
Answer:
B
Knowledge points:
10.2.1 recall Kirchhoff’s first law and appreciate the link to conservation of charge
10.2.2 recall Kirchhoff’s second law and appreciate the link to conservation of energy
10.2.3 derive, using Kirchhoff’s laws, a formula for the combined resistance of two or more resistors in series
10.2.4 solve problems using the formula for the combined resistance of two or more resistors in series
10.2.5 derive, using Kirchhoff’s laws, a formula for the combined resistance of two or more resistors in parallel
10.2.6 solve problems using the formula for the combined resistance of two or more resistors in parallel
10.2.7 apply Kirchhoff’s laws to solve simple circuit problems
Solution:
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